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#include "Visualization/VisualizationGraphRenderingDelegate.h"
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#include "Visualization/qcustomplot.h"
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#include <Common/DateUtils.h>
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namespace {
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const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
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const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");
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/// Tooltip display rectangle (the tooltip is hidden when the mouse leaves this rectangle)
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const auto TOOLTIP_RECT = QRect{10, 10, 10, 10};
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/// Timeout after which the tooltip is displayed
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const auto TOOLTIP_TIMEOUT = 500;
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/// Formats a data value according to the axis on which it is present
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QString formatValue(double value, const QCPAxis &axis)
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{
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// If the axis is a time axis, formats the value as a date
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if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) {
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return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);
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}
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else {
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return QString::number(value);
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}
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}
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void initPointTracerStyle(QCPItemTracer &tracer) noexcept
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{
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tracer.setInterpolating(false);
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tracer.setStyle(QCPItemTracer::tsPlus);
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tracer.setPen(QPen(Qt::black));
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tracer.setBrush(Qt::black);
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tracer.setSize(10);
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}
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} // namespace
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struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
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explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
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: m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{}
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{
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initPointTracerStyle(*m_PointTracer);
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m_TracerTimer.setInterval(TOOLTIP_TIMEOUT);
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m_TracerTimer.setSingleShot(true);
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}
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QCustomPlot &m_Plot;
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QCPItemTracer *m_PointTracer;
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QTimer m_TracerTimer;
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};
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VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
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: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
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{
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}
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void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
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{
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// Cancels pending refresh
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impl->m_TracerTimer.disconnect();
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// Reinits tracers
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impl->m_PointTracer->setGraph(nullptr);
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impl->m_PointTracer->setVisible(false);
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impl->m_Plot.replot();
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// Gets the graph under the mouse position
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auto eventPos = event->pos();
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if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) {
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auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x());
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auto graphData = graph->data();
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// Gets the closest data point to the mouse
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auto graphDataIt = graphData->findBegin(mouseKey);
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if (graphDataIt != graphData->constEnd()) {
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auto key = formatValue(graphDataIt->key, *graph->keyAxis());
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auto value = formatValue(graphDataIt->value, *graph->valueAxis());
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// Displays point tracer
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impl->m_PointTracer->setGraph(graph);
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impl->m_PointTracer->setGraphKey(graphDataIt->key);
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impl->m_PointTracer->setLayer(
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impl->m_Plot.layer("main")); // Tracer is set on top of the plot's main layer
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impl->m_PointTracer->setVisible(true);
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impl->m_Plot.replot();
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// Starts timer to show tooltip after timeout
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auto showTooltip = [ tooltip = TOOLTIP_FORMAT.arg(key, value), eventPos, this ]()
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{
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QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos), tooltip, &impl->m_Plot,
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TOOLTIP_RECT);
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};
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QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip);
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impl->m_TracerTimer.start();
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}
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}
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}
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